ZhETF, Vol. 123,
p. 161 (January 2003)
(English translation - JETP,
Vol. 96, No. 1,
available online at www.springer.com
ELECTRONIC STRUCTURE OF CARBON NANOPARTICLES
Osipov V.A., Kochetov E.A., Pudlak M.
Received: April 19, 2002
PACS: 73.20.Dx, 73.50.Jt, 73.61.Wp
The electronic structure of graphitic nanoparticles is investigated within a gauge field-theory model. The local and total densities of states (DOS) near the pentagonal defects (disclinations) are calculated for three geometries: sphere, cone, and hyperboloid. It is found that the low-energy electron states have a rather specific dependence on both the energy and the distance from a disclination line. In particular, the low-energy total DOS has a cusp that drops to zero at the Fermi energy for disclinations with the Frank index
u<1/2, while a region of a nonzero DOS across the Fermi level is formed for
u=1/2. The true zero-mode fermion state is found for the graphitic hyperboloid. The appearance of an enhanced charge density near the Fermi level for nanocones with the 60 opening angle (180 disclination) is predicted.